Totok Eka Suharto

Universitas Bengkulu | UNIB · Departmnet of Chemistry

This research provides a new route to obtain gold nanoparticles (AuNPs) using an aqueous extract of air-dried Pseuderanthemum acuminatissimum Radlk leaves. The extract was used as a reducing agent in the formation of metallic gold from gold ions, and acted as a stabilizer of the obtained AuNPs in the reaction mixture. The formation of AuNPs in aque...

In situ fabrication of ZnAl2O4 from precursorof zinc nitrate and andaluminium nitrate aqueous solutions was carried out in a rice husk’s SiO2suspension. The reaction’s mixture was heated at 100 °C in open air under stirring and the solvent was evaporated to form white gel. The gel was cooled to room temperature and a solid material was obtained, su...

Many reports recently show that some plant and animal extracts were useful to prepare some desired materials. In line with the statement, this report will present a bioresources candidate that can be used for green preparation of goldnanoparticles. The Scaevola fruteschen (Mill.) Krause was obtained from Enggano island, Bengkulu Province, Indonesia...

Many reports recently show that some plant and animal extracts were useful to prepare some desired materials. In line with the statement, this report will present a bioresources candidate that can be used for green preparation of gold nanoparticles. The Scaevola fruteschen (Mill.) Krause was obtained from Enggano island, Bengkulu Province, Indonesi...

Gold nanoparticles (AuNPs) were synthesized easily using bottom-up method in aqueous extract of air-dried P. obtusifulia R. Br. leaves without elevated temperature. The appearance of surface plasmon resonance (SPR) peak at 549.5 nm in UV-Vis spectrometry analysis give the early evidence of the AuNPs in the solution. The particles shape was in spher...

The aim of this research was to study the effect of stearic acid and TEA concentration on physical and chemical properties of cosmetic emulsion using coconut oil as raw material. The emulsion was made by emulsification of water phase (glycerin, aquadest and TEA) and oil phase (coconut oil, stearic acid, lanolin, cetyl alcohol). To determine the eff...

Aqueous rinds extract of Brucea javanica (L.) Merr has been used as the medium/reducing system for the formation of silver nanoparticles colloids. A solution of 0.01 N AgNO3 (1 ml) was added to the rind extracts (4 ml) at room temperature, and the formation of silver nanoparticles was observed using ultraviolet–visible spectrophotometer. The shape...

A new synthesis method to produce active sulfated zirconia catalyst has been developed. Sulfated zirconium oxide has been prepared by one-step synthesis, where the sulfatation was directly introduced during the gelating step of zirconium hydroxide. The gelating conditions and other synthesis parameters, such as drying and calcination procedures hav...